Subcritical reactivity monitoring in accelerator driven systems

J. L. Muñoz-Cobo, Y. Rugama, T. E. Valentine, J. T. Mihalczo, R. B. Perez

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44 Scopus citations

Abstract

In this paper, an absolute measurements technique for the subcriticality determination is presented. The development of accelerator driven systems (ADS) requires the development of methods to monitor and control the subcriticality of this kind of system, without interfering with its normal operation mode. This method is based on the stochastic neutron and photon transport theory that can be implemented by presently available neutron transport codes. As a by-product of the methodology a monitoring measurement technique has been developed and verified using two coupled Monte Carlo programs. The first one, LAHET, simulates the spallation collisions and the high energy transport and the other, MCNPDSP, is used to estimate the counting statistics from neutron ray counter in fissile system, and the transport for neutrons with energies less than 20 Mev. Through the analysis of the counter detectors it is possible to determine the kinetics parameters and the keff value. We present two different ways to obtain these parameters using the accelerator or using a Cf-252 source. A good agreement between theory and simulations has been obtained with both sources.

Original languageEnglish
Pages (from-to)1519-1547
Number of pages29
JournalAnnals of Nuclear Energy
Volume28
Issue number15
DOIs
StatePublished - Oct 2001

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